Giant-Man is the alias used by several superheroes appearing in American comic books published by Marvel Comics.

Dr. Henry Jonathan "Hank" Pym is a character appearing in American comic books published by Marvel Comics. Created by penciller Jack Kirby, editor-plotter Stan Lee and writer Larry Lieber, Pym debuted in Tales to Astonish #27. He returned several issues later as the original iteration of Ant-Man, a superhero with the power to shrink to the size of an ant. He later assumed other superhero identities, including the size-changing Giant-Man and Goliath; the insect-themed Yellowjacket; and briefly, the Wasp. He is a founding member of the Avengers superhero team, and the creator of the robotic villain Ultron. He is also the ex-husband of Janet van Dyne and the father of Nadia van Dyne, his daughter by his first wife, Maria Pym.